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What is the perfect technique for reaching the top marks in the longer essay questions?

The key for a good 30 marker is sticking to the same tried and tested method. Start off by defining any key terms in your introduction and potentially referencing data you may have been given. Then in the he...
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Answered by Louis G. • Economics tutor
2755 Views

Explain enzyme-substrate specificity

Enzymes and substrates share specificity in that an enzyme will only react with a specific substrate • This is because the active site is complementary in both shape and charge to a given substrate • The mod...
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Answered by Zoe G. • Biology tutor
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1. What is a floating exchange rate system and what factors influence the level of a country’s exchange rate?

A floating exchange rate is when the price of money is determined only by demand and supply, no government intervention occurs. The factors, which influence the level of a country’s exchange rate are the dem...
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Answered by Zoe G. • Economics tutor
6439 Views

N=2a+b, where a is a two-digit square number and b is a two-digit cube number. What is the smallest possible value of N?

Considering the smallest possible value of N will mean finding the smallest possible values of a and b to give the minimum N. As a must be a square number, let's consider the square numbers: 1 squared is 1; ...
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Answered by Katherine H. • Maths tutor
8727 Views

How does DNA replication occur?

DNA normally exists in the cell as a double-stranded structure, comprising of two complementary strands that are held together by hydrogen bonds. DNA replication involves two main steps. Firstly, the enzyme ...
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Answered by Katharine H. • Biology tutor
12612 Views